84 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



subinferior, overlapped by the broad, bluut snout, its breadth considera- 

 ble, but the maxillary not extending far back, not to opposite the front 

 of the eye. Upper jaw protractile, covered with a fleshy lip, inside of 

 which is a small, straight, cartilaginous plate, similar to that on the 

 lower jaw, but much smaller and not evident externally. Lower lip 

 covered with a firm cartilaginous i)late, sharp externally, the upper 

 surface being formed by its bevelled edge. The transverse width of this 

 plate is between four and five times its (longitudinal) breadth. The 

 plate extends in nearly a straight line from one angle of the mouth to 

 the other; its transverse width is contained 2f times in the length of the 

 head. Bye rather large, 5^ in head, If in snout, its position anterior 

 and not high up, 2| in interorbital space. 



Fin-rays : Dorsal 1, 10. Ventrals, 0. Anal I, 9. Dor.sal long, rather 

 low, its first ray just behind the first ray of ventrals, about over the 

 middle of the latter fin, midway between the snout and the middle of 

 the base of the caudal fin ; caudal fin very long, the lobes about equal, 

 longer than the head, widely forked, the accessory rays at its bavse 

 very numerous and recurrent on the caudal peduncle; about eight of 

 these may be distinguished on each side of the fin. Anal fin rather 

 large ; ventrals broad, not reaching vent. Pectorals moderate, not 

 reaching two-thirds of the distance to the ventrals. 



Scales quite small, somewhat imbedded in the skin, very loosely 

 imbricated, or often scarcely imbricated at all, the exposed surfaces 

 longer than high, profusely punctate; squamation quite irregular; the 

 scales smaller on back and belly than on sides, most exposed on caudal 

 peduncle. Scales 21-85-13. Lateral line broadly decurved. 



Coloration very dark, belly paler, but nearly all parts of the body 

 studded with minute dark points. 



Teeth 5-4 (5 on the left side, 4 on the right), hooked, somewhat club- 

 shaped, with a broad masticatory surface. 



Peritoneum black ; intestines much elongate, filled in this specimen 

 with vegetable substance, apparently fine leaves and branches of a 

 Sphagnum-like moss. 



Length of specimen examined, one foot. 



8. MYLOCHILUS CAURINUS (Richardson) Girard. 



1836 — Cyprinm (Leuciscus) cauHiiKs Richardson, Fauna Boreali- American a, iii, p. 304. 

 Leuciscus caurinus DeKay, Zoology N. Y. Fishes, p. 215, 1842. 

 Leuciscus caurinus Cuvier «S: Valenciennes, Hist. Nat.des Poissons, xvii, p. 



325, 1844. 

 Leucisciis caurinus Stoker, Synopsis Fisbes N. Am. p. 159, 1846. 

 Mylocheilus caurinus Gxrard, Proc. Acad. Nat. Sci. Pbila. p. 169, 1856. 

 Alj/locheilus caurinus Girard, Pac. R. R. Expl. x, p. 213, pi. 46, f. 1-4, 1858. 

 Leucosomus cam-inns Guntiiek, Cat. Fishes Brit. Mus. vii, p. 270, 1868. 

 MylocMlus catirinus Jordan & Copeland, Bull. Buftalo Soc. Nat. Hist. p. 155. 1876, 



(name only). 

 Afylochilus caurinus Jordan, Catalogue Fishes, p. 427, 1878. 



